LIFT The Principle of Surroundedness According to this principle, the areas surrounded by others tend to be perceived as figures. For example, the image in Fig. . looks like five figures against the white background rather than the word ‘LIFT’.
Fig. . : Proximity Monocular Cues (Psychological Cues) Monocular cues of depth perception are effective when the objects are viewed with only one eye. These cues are often used by artists to induce depth in two dimensional paintings.
Hence, they are also known as pictorial cues. Some important monocular cues that help us in judging the distance and depth in two dimensional surfaces are described below. You will find some of them applied in Fig. .
. The Principle of Closure We tend to fill the gaps in stimulation and perceive the objects as whole rather than their separate parts. For example, in Fig. .
the small angles are seen as a triangle due to our tendency to fill the gaps in the object provided by our sensory input. Fig. . : Closure P ERCEPTION OF S PACE , D EPTH , AND D ISTANCE The visual field or surface in which things exist, move or can be placed is called space.
The space in which we live is organised in three dimensions. We perceive not only the spatial attributes (e.g., size, shape, direction) of various objects, but also the distance between the objects found in this space. While the images of objects projected on to our retina are flat and two dimensional (left, right, up, down), we still perceive three dimensions in the space. Why does it happen so?
It occurs due to our ability to transfer a two dimensional retinal vision into a three dimensional perception. The process of viewing the world in three dimensions is called distance or depth perception. Depth perception is important in our daily life. For example, when we drive, we use depth to assess the distance of an approaching automobile, or when we decide to call a person walking down the street, we determine the loudness with which to call.
In perceiving depth, we depend on two main